In the default view, I am not seeing the 'molecularly_interacts_with' relation in histogram but it is in the edges file.
If you zoom out with the '+' button in the plot, then 'molecularly_interacts_with' appears but other relations disappear. In zoom out there is also extra blank canvas so Plot.ly is having some issues with scaling this plot. One thought was perhaps the y-axis font size is too large.